dorey



' Dec. 26, 1922.

v G. B. DOREY. FRICTION DRAFT RIGGING.

2 SHEETS-SHEET I FILED DEC-7.1921.

//v VENTOR WITNESSES Patented Dec. 26, 1922.

PATENT orrlcs.

GEORGE BINET DOREY, 01" MONTREAL, QUEBEC, CANADA.

FRICTION DRAFT RIGGING.

Application filed. December 7, 1921. Serial No. 520,658.

To all whom 71L may concern. I

it known that I, G'Eonon BINET Donny,

a sub ect of the hing of Great Britain, and

residing in the city of Montreal Province 5 of Quebec Dommion of Canada, have invented certain new and useful Improvements in Friction Oraft Ri in and do hereb avor-w declare the following to be a full. clear, and Xact description of the same.

My invention relates to improvements in friction draft riggings of very high frictional capacity as used in railway cars and the like for the purpose of absorbing shock, and is especially related to that class wherein frictional elements are used to displace other frictional elements. a greater distance and at a relatively greater speed.

An object of my invention is to provide a friction draft rigging having shoes in reciprocatory engagement with a column member and to provioe means whereby the springs used for the purpose of returning the gear to normal release position after compression will exert a force substantially at right angles to the line of motion of the said shoes.

Another object of my invention is to provide means whereby the shoes will be caused to travel in unison. A difiiculty hitherto experienced in gears of this typehasbeen the liability of one of the wedges moving in advance of the other and thus disturbing the equilibrium of the mechanism.

A main object of this invention is to provide a draft rigging wherein pressure transmitting members having a comparatively short travel and travelling at a slow speed will displace other members a greater distance and at a greater speed.

A further object of the invention is to provide a more certain release of the draft rigging.

Further my invention consists in certain novelties of deslgn and combmation of parts,

which will be more particularly pointed out in the annexed specification and claims.

The accompanying drawings illustrate an example of the embodiment of the invention as applied between the sills of a railway car. Figure 1. is a longitudinal sectional view through the complete gear as assembled, the.

parts being in the normal release or extended position.

Figure 2. is a view similar to Figure 1. except that the gear is shown in the fully compressed position.

Figure 3. is a perspective view of one of the friction shoes.

Figure 4-. is a perspective view showing the casing in section.

Figure 5. is a perspective view of the central friction member or column.

Figure 6. is a perspective view of one of the wedge pressure transmitting members.

Figure 7. is a perspective view of one of the wedge resistance members.

Figure 8 is a longitudinal sectional view showing the draft rigging in the first stage of the release operation of the gear with the column withdrawn from its seating and 7 0 the counter spring compressed.

In the drawings 2 represents the drawbar of the coupler connected by means of key 3 to the yoke 4;. in the usual manner, the yoke embracing casing 5 and the whole being 10- cated between the center sills 6 and 7. In the illustration the casing is shown as abutting against front stops 8 through the medium of follower 9 while the rear of the rigging abuts against rear stops 10 through themedium of follower 11.

The main casing is preferably formed of rectangular shape, and open at one end and for a portion of the sides. The end walls of the casing 12 are oppositely inclined converging towards the longitudinal center of the draft rigging thereby presenting a wedged shaped projection within the CilSlIl". This wedged shaped portion is slotted at 18 to permit the passage of the spring rod 19 through the gear. Beyond the slot a pocket 14 is formed for the reception of the rounded end of the column 16. The column 16 1s extended lengthwise of the draft rigging as at 17 and passes through a hole in the pocket at the end of the casing designated in the illustration as 15. The outer ends of the casing are formed with beveled walls 20 and a recess 21 is formed in each one of these walls for the purpose of allowing a portion of the wedge pressure transmitting memhere to pass through this portion of the wall.

The side walls of the casin 5 are each ")10- vided with an open space at the side for the.

purpose of receiving the spring rod 19 and other parts constituting the resistance por tion of the mechanism. y

The column member 16 is disposed longitudinally within the casing and is formed at 18 with a rounded end which fits within the pocket 14: of the casing, the ,endof the column is threaded to receive a nut at 17 and slotted at 17 to permit the passage of the spring rod therethrough. The two side walls 16 constitute bearing surfaces for the friction shoes 22.

Friction shoes 22 are preferably two in number and are disposed on each side of the friction column with the bearing surface 23 of the shoes in contact with the bearing sur face 16 of the column.

The shoes are preferably made in the form of channels with flanges 24c at the top and bottom one of which is recessed as at 25 and the other formed with a projection as at 26,

the projection on one shoe being; adapted to fit within the recess on the flange of the other shoe and thus cause these two mem bers to travel in iimison relatively to the column. The recess 25 is deeper than the projection 26 and thus these members are free to move relatively to each other in a transverse direction. A portion of the end of the shoes is removed as shown at 27 to permit the straddling of the spring rod when the shoes have moved to the fully compressed position. The exterior of the shoes are formed wedge shaped attheir opposite ends by the inclination of surfaces 23 and 29.

1 Surface 28 isformed to engage with. surface 31 of the wedge resistance member 30 while surface 29 is formed to engage with surface 35 of the wedge pressure transmitting member 33.

Wedge block pressure. transmitting nembers 33 are disposed oneach side of the longitudinal center of the gear and are each formed. with a bearing surface as constituting one face of a wedge These surfaces bear on the beveled surface 20 of the easing 5 and for the purpose of providing greater bearing area for the adjacent wedging surface 35 thewedge block pressure transmitting members are formed with re cessedportions wlthln which the beveled portions 20 of the casing are disposed. Such a construction extending the bearing surface 35 on elther side of the displacement surface 34 provides for great stability. In order to strengthen the ledge 35 and secure it against bending it is bracketed to the adjacent surface by means of rib 36. The beveled portion of the casing is then channeled at 21 :to accommodate this rib. Throughout the length of the wedge blocks a recess is formed 1 between flanges 37 in order that a space may be available to permit the friction column.

to pass through when the blocks move in wardly transversely towards each other. .lnterposed between the drawbar and the wedge block pressure transmitting members and registering therewith as 33 is a follower plate 11, the surface l1 of this member being a friction surface along which the blocks slide during transverse 'movement. I

The resistance part of the mechanism is made up, of the outer springs 39 and inner springs 40 which acting through rod 19 upon wedge resistance members 30 force the friction shoes 22 against the friction column 16 thereby retarding the movement of the wedge block pressure transmitting members. The wedge resistance members 30 are each formed with oppositely inclined ends one of which 31 registers with surface 28 of the friction shoes while theopposite surface 31 registers with surface 12 of the casing. A, hole 32 is provided through which the spring rod 19 passes. The outer face 31 is preferabl flat and forms a bearing for the s arinq's r y "J "(a i 39 and 4-0 through the mednjun of sleeve 30. The sprrn hold all the parts in operative engagement through the rod 19 which threaded at 19 for thereception of threaded caps ll by means of which the tension on the springs is readily adjusted. The cap is kept from turning by means of split lreys 42 passing through the cap and rod.

Within the chai'nbcr formed by the sloping walls ofthe casing there is disposed a counter spring hearing between the cas- I ing wall and the washer plate a l: which is held in fixed relation to the column 16 by means of nut 45. The function of this spring will be fully explained hereinafter.

The operation of the draft rigging takes place as follows. In draft or buffing strains the draft gear is compressed by the ap proach of follmver to casing, the rear of the casing abutting against rear stops through gitudinally on the columnthe wedge re sistance membersv 30 are also moved longitudinallyand' outwardly sliding along face 12 of'the casing 5 and thereby compressing the springs 39 and 40. During this move ment the wedge blocks 33 are moved towards each other therebybringing the wedge faces 35 closer to each. otherand creating a squeez i-ng action on faces 29 of the shoes 22 cansadherence is further lease of the parts atter compression 1 have embodied in this invention a novel form of construction which provides for the release of some oi the frictional elements independently oi the others and further I have used acounter spring in order to return such elements as are moved out of their normal position by the failure oi": some part of the rigging to release at the right time. In. the release of high capacity friction nears there is a tendency for some oi the 1 parts to bind especially at the connnence- Inent oi the releasing operation when the 1n-v ertia due to frictional adherence must be overcome and the parts set in motion and in order to overcome this difficulty I have made the central column member movable out oi itsseating for a limited distance and have provided the spring 4-3 to return it to the normal position as the pressure due to the mainsprings 39 and 4:0 decreases. This condition is very clearly illustrated in Figure 8 wherein the spring 43 is shown as being fully compressed with the column 16 withdrawn from its seating and it will. be noted that such movement has not been accompanied by any relative movement between the column and the shoes 22. The moment, however, that the counter spring 4:? becomes solid and the column 16 is un able to make any further forward movement the shoes 22 commence to slide on the column and as the intensity of the pressure from springs 39 and 4L0 decreases the counter spring 4-3 will gradually re-assert itself thereby drawing back the column 16 to its seating and in position for the next compression stroke.

As the shoes 92 move forwardly they force the wedge pressure transmitting members in a forward and outward direction returning the follower 11 with the drawbar to the normal position.

While I have shown and described what I now consider to be the preferred embodiment of my invention it is to be understood that I do not limit myself to the specific construction herein shown as I consider the same merely illustrative and not by way of limitation and I contemplate all modifications that come within the claims appended hereto.

lVhat i now claim is 4i. triction draft ri n comprising; a

column, shoes in I'QCli)I()( engagement therewith, transversely inwardly movable of draft any such movement.

3. l a iction draft rigging the combination wi n casing oi column within the casing. shoes in reciprocatory engage merit therewith, wedging members in engagement with the casing and adapted to move the shoes relatively to the column, wedginrz; members having engagement with one end of the shoes and sprii disnoscd at i,'i;,?;l1t angles to rue line ofmolion or such shoes and resisting); movement of the parts.

4i. A. friction draft rigging;comprising a casing having; one open andthe other end formed with oppositely inclined walls converging towards the longitudinal line of draft, a column within the casing, shoes slidin on the colinnn, wedge block pressure tran ing members engaging the walls oi the casing; at the open end and adapted to move the shoes, wedge resistance members in engagement with the opposite end of the casing; and with the shoes, the said wedge resistance members being acted upon by transversely mounted springs.

5. A friction draft rigging comprising a casing; having; one end open and the other end formed with oppositely inclined walls converging towards the longitudinal line of draft, a column within the casing, shoes sliding on the column, pressure transmitting members operatively associated with the casing side walls at the open end of the casing and adapted to move longitudinally and transversely of the same while moving the aforementioned shoes, wedge resistance members opposing the movement of the shoes, the said wedge resistance members being; in wedging engagement with the shoes and with the inclined end of the casing.

6. lln a friction draft rigging a casing having; walls at one end thereof wedge shaped and extended within the casing and the opposite end of such casing formed with flaring walls extending in an opposite direction to those of the wedge shaped end, wedge members in engagement with the side walls, wedge members in engagement with the end walls, friction shoes interposed between the said wedge members and adapted to slide on a longitudinally springs maintaining relation.

7. A friction draftrigging having shoes sliding on a friction member, the said shoes having flanges at the-side of the friction member formed with intercaloting portions permitting relative transverse movement between the shoes while causing the Lame to slide on the friction member in unison.

8. A friction. draft rigging having shoes sliding on a friction member, the said shoes having flanges at either side of the ineinbeiu and means to cause the said shoes to travel on the member in unison, the said means comprising a projection formed on the flange of one of the shoes and recess formed in the flange of the other of the said shoes the said recess being adapted to receive the projection when the shoes are in operative relation. r

9. A friction draft rigging having a series of friction elements adapted to be moved relatively to each other in unison during the compressive action of the rig"- ging, means permitting some of the elements to release independently of the others and a spring adapted to be compressed dur' ing the release of these elements and adapted to maintain thevarious elements in a fixed relation to each other when the rigging is in the normal release position.

10. In a friction draft rigging the combination with a drawbar of a friction member having shoes in slidingengagement therewith and springs disposed at right angles to mounted column and the parts in operative the line of draft resisting such movement and wedging means adapted to move the shoes on the member a greater distance than the drawbar.

11. In a friction draft rigging; the combination with a drawbar of a friction memher having shoes in sliding engagement therewith and springs disposed angularly to the line of draft resisting such movement and means adapted to move the shoes on the member a greater distance than the drawbar;

12. In a friction draft rigging the 001m bination with a casing); whereof the interior Walls constitute surfaces for longitudinally movable friction members, springs contained on the outside of the casing and disposed at right angles to the line of draft, friction mechanism contained within the casing and adapted t transpose the transverse force of the springs into a longitudinally acting force In testimony whereof I have hereunto set my hand in the presence of two Witnesses.

shone-n BINET DOREY.

Witnesses R. R. GORDON, EDGAR G. DOLLEL. 

